Draft regulator



June 25, 1935. MQRRQW DRAFT REGULATOR Filed Feb. 24, 1953 2 Sheets-Sheet l ATTO RN EYS DRAFT REGULATOR Filed Feb. 24, 1953 2 Sheets-Sheet 2 Q j 5 gm 3 g l 9 i i" i i SV 4.

ATTORNEYS Cal Patented June 25, 1935 1 UNITED STATES, -BAT NT OFFICE 1 DRAET REQULATOR Clarence H. Morrow, Shaker Heights, Ohio, as-

signor to The Hotstream Heater Company, Cleveland, Ohio, a corporation of Qhio 7 Application February 24, 1933, Serial No. 658,393 2 Claims. (01. 2365-45 This invention relates to dampers such-asare employed for automatic draft regulation, for im-' proving the operation of furnaces. Anexample of such a device is that shown inmy copendingapplication, Serial No. 4431767, filed April 12, 1930, and the objects of this invention are generally to improve the draft regulator there shown. i

More specifically it is an object of this invention to strengthen the shutteremployed,"that the shutter may be of light weight, as of sheet metal, yet have sufiicient strength though of large size.

A further object of the invention is to provide that the device be adapted for application in either of two arrangements, in an opening lead ing to a draft passage, dependent upon the direction of flow therein.

The exact nature of this invention together with further objects and advantages thereof will be apparent from the following description taken in connection with the accompanying drawings, in which Fig. 1 is a view in elevation of an embodiment of the device, taken as from the back when the device is installed; Fig. 2 is a detail section as in the plane of line 22, Fig. 1: Figs. 3, 4 and 5 are enlarged sectional details as in the planes of lines 3-3, 4-4 and 5-5, respectively, Fig. 1; and Figs. 6 and 7 are views in elevation illustrating characteristic installations of the device wherein fiow is had in opposite directions.

With reference now to the drawings, the principal parts of the regulator are an annular base I and a damper or shutter 2.

The base I may be of cast metal bearing on one face the legends indicated in Figs. 6 and 7, and a ferrule flange 3. At its opposite face it is preferably tapered as at 4, that it may be con veniently inserted into the end of a circular pipe 5. The base is provided with radial openings to receive means for securing it with the pipe, such as the screws 6, and the bosses indicated at 1 may be provided at the openings.

The base also is provided with a pair of inwardr, ly extending bosses 8 oppositely but not diametrimounted in the base 2 to swing in the base openin the general plane of the base but sloping sharp- 1y from the horizontal. r

The face of the base carries a second index l2 so angularly disposed from the first index ID that when the-base is disposed plumbed to its sec- 5 nd index l2, the bosses 8 will define a line l3, Fig. '7, having the same slope as the line I l but in the opposite. direction. r

The damper2 is preferably of sheet metal having a peripheral rearwardly turned flange l4, and of suchdiameter as to fit within and substantially close-the circular opening in the base I. On the rear face of the..damper 2 are secured a pair of blocks. l located near the damper periphery correspondingly with the bosses 8. Each block I 5 carries a plug [6 having an outwardly extending projection l1 adapted to fit into the socket of one of the plugs 9. By this arrangement and as indicated Figs. 1 and 4, the damper may be ing on an axis extending generally between the bosses 8, and the damper centered with the base. That the damper may effectively close the base opening, and swing in only one direction from the plane of the base, the latter is provided with a flange I8 back of the damper on the short side of the bosses 8 and a fiange I9 in front of the damper on the long side of the base from the bosses 8,

A brace member is secured on the front face of the damper, extending between the bearing blocks l5 and secured, through the damper, with the blocks, as by the rivets indicated.

The back of the damper is also provided with brace means having a body part 2|, arms 22 at its ends, and arms 23 intermediate its ends. This brace means is preferably a casting, its body part 2| of channel section, and its arm parts of T- section, these sections being provided by the integral flanges indicated in the drawings. The body part 2| is disposed diametrically of the damper, at right angles to the brace 20. Its end arms 22 are adjacent the peripheral flange M of the damper and secured to the damper as by the rivets indicated. The intermediate arms 23 lie opposite the brace 20 and are secured to the latter by rivets passing through suitable open ings in the damper, as indicated.

Thus the two brace means on opposite faces of the damper, are in cruciform relation and serve as ribs which, together with the peripheral flange l4 give great rigidity to the damper.

Cylindrical weights 24 are secured to the rear face of the damper and so proportioned that the latter including its parts thus far described, 55

is substantially balanced on its described axis of swing.

The body part of the brace 2| is provided with a pair of bosses 25 rearwardly extending to carry back of the damper a rod 26 threaded throughout its length and secured in the bosses. A weight 21 is threaded upon this rod for adjustment therealong by rotation. The proportioning and arrangement of the parts is suchthatthe weight 21 is adjustable between a position back of the brace 20 and hence without substantial effect upon the balance of the damper about its axis, and a position at the periphery of the damper, on the long stretch of the latter from the axis, in which position the weight has most effect to unbalance the damper.

With reference now to Figs. 6 and 7, and first to Fig. 6, the draft regulator is shown as applied to a line wherein the flow of draft, as-from furnace to stack, is from left to right. The legend on the base I includes indicia for the direction of draft as indicated, so thatjthe proper index III will be selected as the one to be at the top. Thus when the base is installed. as shown, the long stretch of the damper, which swings inwardly from the base, will movegenerallyin the direction of flow.

As indicated Fig. '7, if the draft-be rightto left, the base is disposed so that its other index I2 is at the top, in which case thedamper will swing in the opposite direction. These arrangements of the damper swing are. the necessary ones for proper regulation, as, will be appreciated by one familiar with the art; and are obtained it will be noted, without any change in relation between the damper and its base.

What I claim is:

1. In an automatic damper of the class described, and having an annular base and a shutter adapted to control the opening of said base, brace means for said shutter comprising a pair of members arranged in cruciform relation on the opposite faces of the shutter and each secured to the latter, one of said brace members being nondiametrically disposed and having bearing means at its ends arranged to mount said shutter on said base for swinging movement, the other brace member being diametrically disposed and having a weight mounted for adjustment therealong, said diametric brace member having arms extending therefrom at its ends and secured at their ends with said shutter, and also having arms opposite said other brace member and secured to the latter through openings in said shutter.

2. In an automatic damper of the class described, and having an annular base and a shutter adapted to control the opening of said base, brace means for said shutter comprising a pair of members arranged in cruciform relation on the opposite faces of the shutter and each secured to the latter adjacent its extremities and. to the other brace member intermediate said extremities, one of said brace members being nondiametrically disposed and having bearing means at its ends arranged to mount said shutter on said base for swinging movement about an axis substantially along said nondiametric brace member, the other brace member being diametrically disposed and having a weight mounted for adjustment thereon toward and from said axis.

CLARENCE H. MORROW. 

